D. The termites ate away at the woodwork until it became quite intrepid.

If you intrepidly chose answer C, congratulations! "Intrepid" is an adjective and answer A uses it as a verb, so we can get rid of that one right away. "Catch" or "overtake" could be used its place. In answer B, Lana is more likely to be "nervous" or "scared," opposites of "intrepid," after her experience on her bike. Woodwork is a nonliving thing, so it isn't usually described as "intrepid," as it is in answer D. Besides, all that termite attention would likely cause it to become "weak" or "shaky." That leaves answer C and the adventurous soul of Freya Stark as the correct choice.